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3x+87=5x-39
We move all terms to the left:
3x+87-(5x-39)=0
We get rid of parentheses
3x-5x+39+87=0
We add all the numbers together, and all the variables
-2x+126=0
We move all terms containing x to the left, all other terms to the right
-2x=-126
x=-126/-2
x=+63
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